As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL PUMP - AFTER ENGINE WARMS THE MGB OIL PRESSURE GOES DOWN TO 1.9 BARS. AFTER SEVERAL SWITCH REPLACEMENTS IT WAS DECIDED THAT THE OIL PUMP WAS CAUSE OF PROBLEM. THE FIRST OCCURRENCE FOR LOW OIL PRESSURE WAS ON 1/5/01 WHICH BRINGS THE PUMP TO WITHIN THE ONE YEAR WARRANTY. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.